Trying to recall a long-time Mac (and now iPhone) writing app?

A few years ago I tried a rather spartan writing and/or note taking application that was essentially text-only, but hyperlinks could be created within the text, linking to other pages or notes created within the application. I’m pretty sure I tried an iPhone version recently but now cannot recall it. I’m currently Googling keywords, and checking App Store, iTunes and other app sites, but I’m not liking the search options I’m given at those sites. Any help appreciated.